import java.util.ArrayList;
import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: LianBao
 * Date: 2024-07-15
 * Time: 8:59
 */
public class test {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            int a = in.nextInt();
            int b = in.nextInt();
        }
    }
}
